Blogger and Medium both allow their user to write and earn money, but the way is different. In case of blogger you can get a free subdomain and hosting.
Medium is totally different idea where you can get paid from the first day. You just need to submit a quality article in medium. If people likes your article, they will claps on your writing. The more claps you get the more you earn. Also earning depends on claps weight. If a person claps frequently, his claps value will be low. So you can visit their site, but reading is not free. You have to spend 5$ per month to read medium, but writing is totally free.
Blogger is a platform where you can create your own blog. They have some free template that can be used to decorate your blog. Also if your blog becomes popular and follow the adsense community rules, you can monetize your blog to earn money.
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